Bug report

Reproduction of the problem

Dojo example.

1. Add the following two tables through the viewHtml tool

<table>
	<tbody>
	<tr>
		<td>
			<p>
				<span>&nbsp;</span>
			</p>
		</td>
	</tr>
	</tbody>
</table>

<table><tbody><tr><td><p><span>&nbsp;</span></p></td></tr></tbody></table>

Both tables are identical, but the first one is formatted.

2. Open the viewHtml dialog again.

Current behavior

The Editor has stripped the p and span tags from the first table. The issue is related to the presence of
  in the span. If it is replaced with text, the elements are not stripped.

Expected/desired behavior

No elements should be stripped from the table.

Environment

• Kendo UI version: 2020.3.1118
• jQuery version: x.y
• Browser: [all]